Must admit I'd be inclined (pardon the pun) to lay a weak dry mortar mix of say 8 sharp sand to 1 cement over the membrane and press the gravel into it as a key for the subsequent layer, instead of the mesh.

The trouble is it sounds like it's quite steep. I am going to put gravel on my drive but iam going to use a rienforcement that comes in squares and snaps together this is layed on sharp sand (40mm) then you put the gravel in it. Otherwise the gravel will go everywhere. Iam using a product called Hebden 40 made from recycled plastic its a little expensive but you need something to hold the gravel in place. Google hebden 40 and have a look they also sell it on ebay.

I have seen a honeycomb covering before, not sure where you get it from but it was on a steep drive and seemed to hold the gravel ok.
It was a rubber I think and the honeycombes were about 80mm across.